Digital circuits play another important role: They can store information. These circuits form a sequential circuit, because the output of the circuit also serves as input to the circuit. That is, the existing state of the circuit is used in part to determine the next state.
Many types of memory circuits have been designed. We examine only one type in this book: the S-R latch. An S-R latch stores a single binary digit (1 or 0). An S-R latch circuit could be designed using a variety of gates. One such circuit, using NAND gates, is pictured in FIGURE 4.12.
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